Hi Moggiwills! Where are you in North Wales? If your dipstick turns out to be too short or incorrectly marked your are welcome to compare it to mine or mark new levels.IIRC the 4.4 engine should use 5w40 oil and the 4.8 engines 5w30 unless there was a change point somewhere in the 4.4 ‘s engine life.I once dropped the oil filler cap on my S1, retrieved with some difficulty if I remember. The Aero plus 8’s have the filler cap partly hidden under the front wing making it a delicate operation to remove!